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#!/usr/bin/ruby
# -*- coding: UTF-8 -*-
if ((1..10) === 5)
  puts "5 在 (1..10)"
end
if (('a'..'j') === 'c')
  puts "c 在 ('a'..'j')"
end
if (('a'..'j') === 'z')
  puts "z 在 ('a'..'j')"
end
 
 
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